Concealed hinge.



D.- WILLIAMSON. CNUEALED HINGE. AAIIILIGJIION FILED MAYS. 1909.

Patented Feb. 22, 1910.

@h-Womad I To all whom it may concern.'

vsaras- CONCEALED HINGE.

Be it known that I, DAvID YILLiAMsoN, a. citizen of the United States, residingat New `York city, Manhattan, -`county and State of N ew York, have invented new and useful Improvements in Concealed Hinges,

of which thefoll'owing is a s1 ecicatioii- This invention' relatesl to a4 hinge for doors and similarobjects, which is so constructed ,that its members may be com pletely countersuiik within the woodwork and that neither knuckles nor other parts thereof'are exposed wli'eiithe door is closed.

In' the accompanying drawing: Figure 1' is a horizontal section lof my improved hinge, on linel-l, Fig. 3, showing the door closed; Fig. 2 a similar section on line 2 2, Fig. 3,showing the ldoor open; Fig. 3 a front view of the fixed hinge-member; Fig.` el a similarl view of the movable inember; Fig. 5 a horizontal sectionl ofa modiication of the hinge, and Fig. G a side viewthereof, showingthe door open.4

-I The hinge is composed of a fixed member anda movable member, comprising, respectively, securing plate 10, and socket plate 11, which ,are adapted to be countersunk into the door frame 12 and door 13. 'Plate has screw holes 14 and an inwardly projecting boss 15. From plate 10 there extends outwardly an arm which isT-shaped in cross-section and passes with its web l'G. into boss 15, to which it is secured,by rivets 1T. The head 18, of the T-shaped arm is provided along each of vits two upright edges with-a rounded knob 19 constituting a bearing and .setback from the corresponding edge ,of plate 10. l Plate 11 of the movable member has screw holes 20 and is made box-shaped, it being provided with a central recess Q1. Yithin this recess are formed a pair of parallel grooves or bearing sockets 22 spaced to correspond to the distance between knobs 19 which they arevadapted, tovaccomniodate. It is preferred "to traverse each groove Q2 by a number of ribs 23 engaging corresponding slots @-1 of knobs 19, said ribs 'serving to' 'reduce wear4 and also to sustain the weiglit'of the door. v

lVit-h recess Q1 there communicates an outwardly extending tubularl casing 25 containing a spiral spring 26. The outlzvrend of' this spring is engaged by a headed nut ets 33.

27 into which is tapped the outer'l threaded `Specification of Letters Patent, Pgitefqld Fgh, 22, 11916. .Application filed May 3,1909. Serial No. 493,507.v v

end-of a rod 2S, theinner end of which is pivotally connected by pintle 29, to knuck-les 30' projecting from head 18 intermediate 'knobs 19. When the hinge is closed,

spring :26 is distended and the entire'operative mechanism is`concealed, (Fig. 1). lVlien vthe doorl is swungoutward, it will turn on outer knob 19, while spring Q6 will 'become compressed to automatically close door to be swung through an angle of about j 90.o in either direction,- while with'the construction' shown in Figs. 5 and 6, it may be' swung through an angle of about 180.'

lith the latter construct-ion, the two coulitersunk members of the hinge aie1siibstan tial duplicates of the movable member shown in Fig. 1. That is to say, each member coni prises a plate 31 adapted to be'countersunk,

into door frame 1Q or door 13, and providedwith recess 3Q and grooves or bearing sock- R'ecess 32 communicates .with a tubukso y lar casing 34 containing spiral spring A35, i

headed nut 36 and rod 37. Between the two members. constructedy as described, is interposed a fixed member comprising a plate'38, from each face of which projects la T-shaped arm 39. The two heads of these arms are.- hingeably connected to rods 3T and are provided at their edges with rounded knobs 10 adapted to engage the grooves 33 of yplates 31. One. of the springs 35 should be somewhat i weaker than the other spring, the weaker spring being shown to becontained in door 13. vVlie/n the. door is 'swung outward, itfw'll iii-st turn 9()O on the outer right hand knob 40, and then an additional o on the outer lefthand knob, so that a sweep of'.

180o is obtained. It. the door is swungin'ff ward, the operation is reversed, as will be readily understood.

It will be seen that wth'my 'improved vhinge, lthe knobs carried b v the fixed mem-v bei areentirely iiiclose'd within the movable member when ,the door is closed, so that- 'no unsightly protubeiances of :my kind are exposed during the vnormal position of the parts;

I claim:

1. A hinge comprising a fixed plate, a head projectingtherefrom and having a pair of knobs set back from the edges of said' plate, amovable plate having a pair of bearing sockets adapted to seat said knobs, and

means for yieldingly connecting the plates.

2. A hinge. comprising a ixed plate, a head projecting therefrom and having a pair rof knobs set l,back from the edges of said plate, a movable plate having a pair of bearing. sockets adapted to seat said knobs, and a spring-influenced rod operatively connected to fthe'movableplate and pivotally eonf 3. A hinge `comprising a.l plate, a T- shaped yhead rojecting therefrom, knobs at the upright e ges of fsaidhead, a second reeessedplate adapted yto receive said head andA having bearing sockets for said knobs, and

` means for yieldingly connecting tlie plates.

i 4. A hinge comprising a plate adapted to be secured to 'ajixed object, a 'fi-shaped head projecting therefrom, knobs at the upright edges ofsaid head, Va. recessed plate .adapted to be secured to a movable object and to receive. said head, said recessed plate havingj bearings for said knobs, a tubular casing' opening into the recessed plate, an inclosed spring, a rod controlled thereby, and means for pivoting the rod to the head.

5. A hinge comprising a plate adapted to be secured to a fixed object, a T-shapedvhead,

projecting therefrom', knobs at the upright edges of said head, a recessed plate adapted to be secured to a movable object' and to re' ceive said head, said recessed plate having bearings for said knobs, a tubular casing opening into the recessed plate, an inclosed spring, a headed nut engaged thereby a rod W. R. SCHULZ, vFRANK v. BRIESEN. 

